Signaling system.



H. O. HUGH SIGNALING SYSTEM.

APPLICATION IILED MAY 4, 1909.

1,037,330; Patented Sept. 3,1912.

- zen of the United I the line conductors and theleakage.

resistance included on either side thereof.

central station toward theend of thel'line, in

(UN TED STATES PATENT oF IoE.

HARRY 0. HUGE, OF SANDWICH, ILLINOIS, .ASSIGNOR TO SANDWICH ELECTRICGOMPAN Y, 0]! SANDWICH, ,ILLINO IS, A CORPORATION OF ILLINOIS.

SIGNALING SYSTEM.

Specification of Letters Patent.

Application filed May 4, 1909. Serial No. 493,942. v

T 0 all whom, it may concern:

Be it known that I, HARRY O. RUGH, citi- States, residing at Sand- Wich,in the county of Dekal'b and State of Illinois, have invented a certainnew and useful Improvement in Signaling Systems, of which the followingis a full, clear, concise, and exact description, reference being had tothe accompanying drawings, forming a part of this specification.

y invention relates to signaling systems and has for its object theprovision ofimproved means for operating substation signaling devices.

My invention, in its preferred form, is applicable to step-by-stepselectors, in which an operating relay for said selectors is bridgedacross the line conductors at the substations, and my inventioncontemplates the inclusion of resistances of such character in the relaycircuitas to properly distribute the relay-operating current throughoutthe various relays. a

I will explain my invention more in detail by referen' e to theaccompanying drawing, in which have shown a central station Aand-substations B, C and D, which stations are connected together bymeans of the metallic conduotorsl and 2. .At the central station I haveshown two batteries 3' and4, which can be connected to the lineconductorsby means of keys 5 and 6, one of said keys sending positivebattery impulses over lino conductors, and the otherfnegative, thepositive impulses preferably stepping up the selector mechanism, and thenegatiye, releasing-same to normal Q The substation apparatus consistspref erably of a polarized relay 7, bridged across the line conductors,which relay has in its preferred form in the bridge connection a saidresistances being respectively numbered '8 and 9. The resistances, asshown, are adjustable, so that the relay-operating current may beadjusted to proper operatioh of the relay. I find, in practice, that iti's'wise to gradually decrease this resistance 8 from the order tocompensate for the resistances of is "provided'liwitli' a Patented Sept.v3, 1912.

.tive impulses to operate the relay 11, thereby to step u'p theselecting device 12, so that 1t may engage the contact spring 13, andthereby establish a local circuit to operate the bell 14. The polarizedrelay is also provided with a contact point 15,,which, in this instance,is susceptible of negative influences to operate the relay 16, therebyto release the selector 12 and restore it to normal. At each substationI have also shown the receiver 17 and transmitter 18, together with theassociated instrumentalities.

From the foregoing, it will be apparent that I am able to compensate forline resistance and leakage, may operate properly. This is due to theproper selection of the resistance in series with each selectoroperating relay, and thus its proper current supply is provided, Bysplitting the resistance as I have shown at one of the stations and:having one between each terminal of the relay and its correspondingline wire, I am able to' compensate properly even though one or theother of the line wires tive or a portion of the relay winding begrounded upon the framework.

Wh' larly described the preferred embodiment of my invention, I do notlimit myself to the precise construction and arrangement as herein setforth, but

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is A step-by-step signaling system havingmetallic line conductors for. uniting a centra station and substations,a step-by-ste selector at each substation, a relay bridged across theline conductors at each selector for operating said selector, electricalresistances in series with each relay, to evenly distribute so that allthe relays? may be temporarily defecthe relay operating current, one ofsaid resistances being included between each terminal of the relay andits-associated line conductor, and means at the central station forsupplying said relay operating current. In witness whereof, I hereuntosubscribe my name this 19th day of April A.-D., 1909.

' HARRY O. RUGH., Witnesses:

Max ZABEL,

- The polarized rel'a pag or tl ilspaten t we gbtaiiied fo'ian centsWashingt J EAN? rimzorr.

each, the Commissioner. of Patents, M11 5. 0." I

